CVE-2026-1628
Mattermost allows external websites to open within the app, exposing preload functionality to non-trusted sites.
CVSS Score
4.6
EPSS Score
0.0%
EPSS Percentile
0th
Mattermost Desktop App versions <=5.13.3 fail to attach listeners restricting navigation to external sites within the Mattermost app which allows a malicious server to expose preload script functionality to untrusted servers via having a user open an external link in their Mattermost server. Mattermost Advisory ID: MMSA-2026-00596
| CWE | CWE-829 |
| Vendor | mattermost |
| Product | mattermost |
| Published | Mar 2, 2026 |
| Last Updated | Mar 2, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
Mattermost / Mattermost
0 ≤ 5.13.3
Credits
N/A